Of course propane (and other hydrocarbon refrigerants) operate at a
LOWER pressure than R12 (and MUCH lower than R134), so even with
added heating at the end of the day, the system is likely at a lower
pressure than an R134 system that is actually running.

On Jul 26, 2006, at 5:39 PM, Robert Fisher wrote:

> The pressures in an MVAC system are actually at their highest 30-45
> minutes
> after the engine is shut off due to the system continuing to absorb
> heat
> from the engine compartment without having any way to dispel it.